Astronomy Picture of the Day . ... 31.12.2013 . ... It is visible as the dark indentation to the red emission nebula in the center of the above photograph. The horse-head feature is dark because it is really an opaque dust cloud that lies in front of the bright red emission nebula . ... Also visible at the bottom left of the picture is a greenish reflection nebulae that preferentially reflects the blue light from nearby stars . ... December 2013 . ... Publications with keywords: Horsehead Nebula . ...

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• Orion's Horsehead Nebula
• Orions Horsehead Nebula

... October 25, 1997 . Orion's Horsehead Nebula . ... Explanation: The Horsehead Nebula is one of the most famous nebulae on the sky. It is visible as the black indentation to the red emission nebula seen just to the right of center of the above photograph. ... The horse-head feature is dark because it is really an opaque dust cloud which lies in front of the bright red emission nebula . ... The emission nebula 's red color is caused by electrons recombining with protons to form hydrogen atoms. ...

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• APOD: October 2, 1996 - Orion's Horsehead Nebula
• APOD: 2003 October 7 - The Colorful Horsehead Nebula
• APOD: 2014 October 8 - NGC 6823: Cloud Sculpting Star Cluster

... October 9, 1997 . Hale-Bopp and the North American Nebula . ... Explanation: Comet Hale-Bopp 's recent encounter with the inner Solar System allowed many breath-taking pictures. Above, Comet Hale-Bopp was photographed on March 8th in the constellation of Cygnus . ... The North American Nebula is about 1500 light years away, much farther than the comet, which was about 8 light minutes away. ... About APOD > . ...

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• APOD: October 8, 1996 - ROSAT Explores The X-Ray Sky
• APOD: 2000 December 29 - The Dark Horsehead Nebula
• Arcetri Star-Formation Group Publications

... Tonight's Sky . ... The Magazine . ... Observing . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Bright planets meet at dusk . ... Astronomy magazine subscribers can read the full article for free. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter....

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Supernova 2009js in NGC 918 . This page is devoted to information on Supernova 2009js in NGC 918 . Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main page . Information on the original web pages for many of these images can be found on the updates and links web pages. Discovered independently by Lick Observatory Supernova Search (USA) and Koichi Itagaki (Japan). ... 2009/10/11.44 . 17.2 . ... Joseph Brimacombe . ...

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... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Aurora . ... Corona . Fireballs . ... Zodiacal Light . ... The first thing to do is get acquainted with what the night sky looks like. ... The National Schools Observatory web site has very good horizon views of the sky for the current night. ... If the object is moving slowly across the sky then it may be one of the larger satellites. ... Cloudbait Observatory - October 2002 . ... October 2003 Aurora at Armagh . ...

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• ISS and ATV visible from Ireland in Evening Skies | International Year of
• M.D. Smith, Research Astronomer
• Beautiful October Morning skies in Ireland | International Year of Astronomy in

I was wondering what conditions should be met to have the "darkest" sky .. ... Upon the above publication of the Southern Galactic hemisphere, TunГ Tezel started seeking opportunities to create the Northern counterpart image. ... So, the initial quest of having the darkest possible sky have delivered us these two all-sky images of the two galactic hemispheres as seen from Planet Earth. Zoomable and 'full-screenable' fisheye view of the "darkest sky" Southern Galactic Hemisphere image. ...

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• ESO - ESO-Enews #24: October 2012
• The Brightness of the Night Sky
• Detailed view of the Prawn Nebula from ESO's VST | ESO

... MNRAS, 337, 401-408 (2002). ... BHAT, N.D.R., CAMILO, F., CORDES, J.M., NICE, D.J., LORIMER, D.R. & CHATTERJEE, S. "Arecibo observations of Parkes multibeam pulsars". ... ApJ, 579, L25-L28 (2002). ... MNRAS, 338, 425-427 (2003) . ... MNRAS, 335, 1085-1090 (2002). ... GREENHILL, L.J., KONDRATKO, P.T., LOVELL, J.E.J., KUIPER, T.B.H., MORAN, J.M., JAUNCEY, D.L. & BAINES, G.P. "The discovery of H 2 O maser emission in seven active galactic nuclei and at high velocities in the Circinus galaxy". ...

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• The Orion Nebula
• Magellanic Cloud HI emission spectra
• HIPASS Bright Galaxy Catalog

... The Pleiades star cluster, also known as the Seven Sisters and Messier 45, is a conspicuous object in the night sky with a prominent place in ancient mythology . ... The stars in the Pleiades are thought to have formed together around 100 million years ago, making them 1/50th the age of our sun, and they lie some 130 parsecs (425 light years ) away. ... Data for these stars are listed in a table below. ... Yes . ... WEBDA Pleiades cluster data . ... M45: The Pleiades Star Cluster (2007 November 18) ...

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• The Large Magellanic Cloud
• What is HISA?
• HISA Poster for the 195th Meeting of the AAS, January, 2000

... Artist's concepts of two ATLAST designs . ... ATLAST: Characterizing Habitable Worlds (Postman et al. ... Science drivers and requirements for an Advanced Technology Large Aperture Space Telescope (ATLAST):Implications for technology development and synergies with other future facilities (Postman et al.) ... A 16-m ATLAST Mission Design (Lillie et al.) ... Conceptual Design for a 16-m Segmented UVOIR Space Telescope (Korechoff et al.) ... Science with an 8-m to 16-m ATLAS Telescope (Postman et al.) ...

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• John H. Debes
• HST this week: 296
• The Mass-loss Return from Evolved Stars to the Large Magellanic Cloud. II. Dust

home publications > mercury . SEARCH ASP SITE: Match ALL words Match ANY word . ... ASP Conference Series . ... Publications of the ASP (PASP) . ... Astronomy Beat . ... Mercury Magazine Contents and Select Excerpts . ... September/October 2005 . ... As much a need for the science community as for the nation, the astronomy education and public outreach profession is [finally] coming into existence. ... Sky Events, Richard Talcott . September Sky Map | October Sky Map | ... education | ...

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• ASP: SETI?s Prospects Are Bright
• ASP: Contents, September/October 2003
• ASP: Contents, September/October 2006

... Planets . ... Earth Satellites . ... Monthly Sky Notes . ... As the sun sets in the west each evening, Jupiter, the largest planet in our Solar System, is rising in the east in the constellation of Aries, where it is visible throughout the night setting just before sunrise. ... On 28 October the Earth comes between the Sun and Jupiter, in opposition